插值条件下格网DEM坡度计算模型的噪声误差分析  

Noise Error Analysis of Slope Algorithms Based on Grid DEM Derived from Interpolation

作　　者：卢华兴[1] 刘学军[2] 王永君[2] 田梓文[3] 

机构地区：[1]东南大学交通学院,江苏南京210018 [2]南京师范大学地理科学学院,江苏南京210097 [3]国家海洋局第一海洋研究所,山东青岛266100

出　　处：《测绘学报》2012年第6期926-932,共7页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(40901240;40971230;41071244);国家海洋局第一海洋研究所专项(GY02-2008G21)

摘　　要：针对目前DEM数字地形分析的精度评价多数不考虑DEM误差的空间自相关性或仅采用经验的自相关性模型问题,从DEM插值入手,从理论上推导了插值条件下格网DEM邻域窗口内坡度噪声误差的空间自相关性模型以及坡度精度模型,并选取了3种典型的插值方法和4种坡度差分算法,从试验角度分析在顾及和不顾及空间自相关性两种情况下的格网DEM坡度计算模型的噪声精度,试验结果表明:坡度精度受DEM噪声误差的空间自相关性影响较大,并与DEM插值方法和坡度计算模型中的差分算法有关。（NA）, its slope acc The slope autocorre chosen to The e error uracy accur lation. te can be sign xtraction of slope from grid DEM is generally through difference algorithms using neighbor analysis issubiect to3 factors： DEM error,DEM data structure and slope algorithms. This study focuses on that is caused by DEM no acy model was deducted As a validating procedur st error ficantly tion methods and s se error component on the condition of points interpolating to grid DEM. under two conditions： considering and not considering DEM noise error e, 3 typical slope difference algorithms and 4 interpolation methods was autocorrelation influence influenced by DEM noise ope algorithms. on slope accuracy, the experimental results show that slope accuracy error autocorrelation, and will be changed with the different interpolation methods and slope algorithms.

关 键 词：数字高程模型 坡度 精度 空间自相关 

分 类 号：P284[天文地球—地图制图学与地理信息工程]